Evolution and Its Control Factors of the Changhsingian Radiolarian Fauna at the Shangsi Section in Jiange County, Guangyuan City, Sichuan Province

详细信息   

• 责任者：Nie Xiaomei (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Wuhan 430074 ; China) ; Lei Yong
• 刊名：Geological Review
• 出版年：2012
• 卷期：58(5)
• 关键词：放射虫类 ; radiolarians ; 四川 ; Sichuan Province
• 页码：p.809-815
• 图表：3 illus., 31 refs.
• 分类号：1103
• issnNo：ISSN0371-5736
• isbnNo：CN11-1952/P

摘要

A well-preserved Changshingian radiolarian fauna was obtained from bedded siliceous limestone and interbedded siliceous shale of the Dalong Formation in Shangsi area, Guangyuan, Sichuan, South China.  The research shows that the abundance and diversity are closely related to sea level changes of Changhsingian age at the Shangsi Section. Where abundance and diversity reached higher values, the sea level would have peaked （ marine flooding surfaces ）.  The abundance and diversity of radiolarians from the early Changhsingian is greater than that of the late Changhsingian age, which coincides with the opinion that the marine water was deeper in the early Changhsingian than that in the late Changhsingian. Furthermore, foraminifer and radiolarian abundance showed a good negative correlation which may be caused by their different living habits and changes of water depth. Analysis shows that: the development of the Late Permian radiolarian fauna of the Shangsi Section, may result from changes of water depth.